Automobile muffler

ABSTRACT

An automobile muffler comprising an inner board with a gas-in tube is installed on one side, a outer board with at least one gas-out tube is on the other side, an external hood covers the inner and outer boards vertically to form a chamber, a plurality arrow shape bars are installed horizontally along two spiral lines inside the chamber; two adjacent arrow shape bars are installed with special angle without vacant space; the tips of the arrow shape bars face the gas-in tube, the side wings form an included angle with the tip. When the high pressure, high temperature exhaust gas by engine enters the chamber from the gas-in tube, the exhaust gas is divided and dispersed by the arrow shape bars and forms disturbance condition, the exhaust gas collides to lower the noise level; the arrow shape bars increase the contact time and area with gas that lowers the temperature and pressure effectively.

BACKGROUND OF THE INVENTION

I. Field of the Invention

This invention relates generally to a muffler and, more specifically, toan automobile muffler that is applied on automobile engine to reduceengine noise.

II. Description of the Prior Art

Heretofore, it is known that engines of automobiles produce exhaust gaswith high pressure and high temperature; most of the known mufflers arefilled with noise reduction cotton in straight-line structure, or havepartitions to disturb exhaust gas to reduce noise with cotton andpartitions. However the known mufflers simply reduce noise and cannotincrease exhaust gas flow rate, some automobiles still cannot exhaustsmoothly, such condition not only effects power but also causes moregasoline consumption and shortens engines' life.

Mufflers with partitions can lower noise level, however when the exhaustgas is disturbed, resonance is generated on the inner wall of themufflers. Most of the straight line designs with cotton have a metal netinternally to absorb high temperature of exhaust gas, the heat absorbedby metal net and noise absorbed by cotton to achieve lower temperatureand normal pressure exhaust gas; however such design only has noisereduction cotton on the exhaust gas path, the noise reduction only haslimited effect.

SUMMARY OF THE INVENTION

It is therefore a primary object of the invention to provide anautomobile muffler that has the exhaust gas generated by engine dividedand dispersed by the spiral shape arranged arrow shape bars to have thegas collides to lower the noise level; the installation of the arrowshape bars increases the contact time and area with gas that lowers thetemperature and pressure effectively.

In order to achieve the objective set forth, an automobile muffler inaccordance with the present invention comprises an inner board with agas-in tube is installed on one side, a outer board with at least onegas-out tube is on the other side, an external hood covers the inner andouter boards vertically to form a chamber, a plurality arrow shape barsare installed horizontally along two spiral lines inside the chamber;two adjacent arrow shape bars are installed with special angle withoutvacant space; the tips of the arrow shape bars face the gas-in tube, theside wings form an included angle with the tip. When the high pressure,high temperature exhaust gas by engine enters the chamber from thegas-in tube, the exhaust gas is divided and dispersed by the arrow shapebars and forms disturbance condition, the exhaust gas collides to lowerthe noise level; the arrow shape bars increase the contact time and areawith gas that lowers the temperature and pressure effectively.

It is still an object for the invention to provide an automobile mufflerin which the length and thickness of the arrow shape bars are adjustableto meet different requirement of different engines.

BRIEF DESCRIPTION OF THE DRAWINGS

The accomplishment of the above-mentioned object of the presentinvention will become apparent from the following description and itsaccompanying drawings which disclose illustrative an embodiment of thepresent invention, and are as follows:

FIG. 1 is a perspective view of the present invention;

FIG. 2 a is a side cross-sectional view of the present invention;

FIG. 2 b is a top cross-sectional view of the present invention; and

FIG. 3 is an application view of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1 through FIG. 2 b, the muffler 1 of the presentinvention is in tube shape, an inner board 11 with a gas-in tube 12 isinstalled on one side of the muffler 1, a outer board 13 with at leastone gas-out tube 14 is on the other side of the muffler 1, an externalhood 15 covers the inner and outer boards 11, 13 vertically to form achamber 16.

The major characteristic of the present invention is to have a pluralityarrow shape bars 17 installed horizontally along two spiral lines insidethe chamber 16; since the arrow shape bars 17 are installed along twospiral lines, therefore the arrangement looks like ladder, two adjacentarrow shape bars 17 are installed with special angle without vacantspace, as shown in FIG. 2 b. The tips 171 of the arrow shape bars 17face the gas-in tube, one of the side wings 172 forms an included anglewith the tip is around 25° to 45°, the best angle is 38°; the length ofthe arrow shape bars is from 25 mm to 50 mm, the best length is 38 mm;the thickness of the side wings 172 is from 1.00 mm to 2.00 mm, the bestthickness is 1.25 mm; however in real application, these are notlimited, the thickness of the side wings 172 vibrate along with the gasflow and form self-interference condition to lower the noise.

In real application, as shown in FIG. 3, when the high pressure, hightemperature exhaust gas by engine enters the chamber 16 from the gas-intube 12, the exhaust gas is divided and dispersed by the arrow shapebars 17 and forms disturbance condition, the exhaust gas is divided anddispersed by the spiral shape arranged arrow shape bars 17 to have thegas collides to lower the noise level; the installation of the arrowshape bars 17 increases the contact time and area with gas that lowersthe temperature and pressure effectively, the disturbance condition alsolowers the noise level effectively.

The application of the present invention not only reduces the resonancecondition as the partition design but also improves the poor noiseabsorbability of the noise reduction cotton, and makes the engine poweroutput smoothly, achieves gasoline saving and longer engine life effect.The length and thickness of the arrow shape bars of present inventionare adjustable to meet different requirement of different engines.

While a preferred embodiment of the invention has been shown anddescribed in detail, it will be readily understood and appreciated thatnumerous omissions, changes and additions may be made without departingfrom the spirit and scope of the invention.

1. An automobile muffler comprising: an inner board with a gas-in tubeis installed on one side, a outer board with at least one gas-out tubeis on the other side, an external hood covers said inner and said outerboards vertically to form a chamber, a plurality arrow shape bars areinstalled horizontally along two spiral lines inside said chamber, twoadjacent said arrow shape bars are installed with special angle withoutvacant space, the tips of said arrow shape bars face said gas-in tube,the side wings form an included angle with the said tip, when the highpressure, high temperature exhaust gas by engine enters said chamberfrom said gas-in tube, the exhaust gas is divided and dispersed by saidarrow shape bars and forms disturbance condition, the exhaust gascollides to lower the noise level, said arrow shape bars increase thecontact time and area with gas that lowers the temperature and pressureeffectively.
 2. The automobile muffler recited in claim 1, wherein thelength and thickness of said arrow shape bars are adjustable to meetdifferent requirement of different engines.
 3. The automobile mufflerrecited in claim 1, wherein the included angle formed by said tip andone of said side wings ranges from 25° to 45°.
 4. The automobile mufflerrecited in claim 3, wherein the included angle formed by said tip andone of said side wings is 38°.
 5. The automobile muffler recited inclaim 1, wherein the length of said arrow shape bars is from 25 mm to 50mm.
 6. The automobile muffler recited in claim 5, wherein the length ofsaid arrow shape bars is 38 mm.
 7. The automobile muffler recited inclaim 1, wherein the thickness of said side wings is from 1.00 mm to2.00 mm.